Error code99
The 4-way valve error code indicates the compressor stops when indoor heat exchanger temp minus room temp exceeds 20°F (cooling) or falls below -20°F (heating). The manual lists no action for this code.
- Model
- Fujitsu General 410A
- Display shows
- 4-way valve error (99)
- Type
- Error code
- Source
- Manual p. 7
What 99 means
4-way valve error p. 7
Common causes
- When the indoor heat-exchanger temperature is compared with the room temperature, and either following condition is detected continuously two times, the compressor stops. Cooling or Dry operation [Indoor heat-exchanger temp.] - [Room temp.] > 18°F (10°C) Heating operation [Indoor heat-exchanger] - [Room temp.] < -18°F (-10°C) p. 7
- 4-Way Valve Error – When the indoor heat exchanger temperature is compared with the room temperature, and either following condition is detected continuously two times, the compressor stops: Cooling or Dry operation (Indoor heat exchanger temp.) - [Room temp.] > 20°F (10°C) Heating operation (Indoor heat exchanger temp.) - [Room temp.] < -20°F (-10°C) p. 7
- -Check connection of molex plug. p. 7
- -Check each thermistor. p. 7
- -Check the solenoid coil and 4-way valve. p. 7
- -Check voltage of 4-way valve. p. 7
If 99 is still not resolved
The manual gives no further instruction for this code. Open the code table in the PDF or contact Fujitsu General service.
This page summarises what the manufacturer’s manual says about 99; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with Fujitsu General. Found a mistake? Report an error.